      (context-get context-stack key nil))
   ([context-stack key not-found]
      ;; First need to check for an implicit top reference.
-     (if (= :implicit-top key)
+     (if (.equals :implicit-top key) ;; .equals is faster than =
        (first context-stack)
        ;; Walk down the context stack until we find one that has the
        ;; first part of the key.

;;
;; Context stack access logic
;;

(defn find-containing-context
  "Given a context stack and a key, walks down the context stack until it

   so nil when no context is found that contains the key."
  [context-stack key]
  (loop [curr-context-stack context-stack]
    (if-let [context-top (peek curr-context-stack)]
      (if (contains-fuzzy? context-top key)
        context-top
        ;; Didn't have the key, so walk down the stack.
